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Negative-electrode active material for nonaqueous-electrolyte secondary battery production process for the same, negative electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery

a nonaqueouselectrolyte and active material technology, applied in the direction of carbon-silicon compound conductors, non-conductive materials with dispersed conductive materials, cell components, etc., can solve the problems of reducing the electrical resistance of negative electrodes. , to achieve the effect of reducing the electric resistance, enhancing the conductivity of lithium ion, and lowering the electric resistance resistan

Active Publication Date: 2015-03-19
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patent is that it describes a new system for controlling electricity in a way that allows for more efficient and effective use of the electricity in various applications. This system involves using special techniques to control the flow of electricity in a way that reduces energy waste and improves performance.

Problems solved by technology

The binding agent to which the loads have been applied causes declines in adhesiveness between the negative-electrode active material and the current collector, and destructions in conductive paths within a negative electrode.
Moreover, the repetitive expansions and contractions of the volume of the negative-electrode active material generate distortions in the negative electrode.
Therefore, when a silicon-based material, like silicon or silicon oxide, is used as a negative-electrode active material, the expansions and contractions of the negative-electrode active material result in such a problematic issue that no battery performance, such as initial efficiency, capacity and durability which the silicon-based material is supposed to have inherently, is obtainable.
However, the negative-electrode active material according to Patent Gazette No. 1 had a structure in which the Si particles were buried in the amorphous carbon with low conductivity.
Thus, using the negative-electrode active material, in which Si particles and amorphous carbon have been composited, results in such a possibility that an output characteristic of the lithium-ion secondary battery declines.Patent Gazette No. 1: Japanese Patent Gazette No. 4281099

Method used

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  • Negative-electrode active material for nonaqueous-electrolyte secondary battery production process for the same, negative electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery
  • Negative-electrode active material for nonaqueous-electrolyte secondary battery production process for the same, negative electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery
  • Negative-electrode active material for nonaqueous-electrolyte secondary battery production process for the same, negative electrode for nonaqueous-electrolyte secondary battery, and nonaqueous-electrolyte secondary battery

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embodiment

[0092]The present invention is hereinafter described concretely, while giving an embodiment thereof.

Manufacture of Coin-Type Lithium-Ion Secondary Battery

[0093]Nanometer-size Si particles (produced by HAMAMATSU NANOTECHNOLOGY Co., Ltd.) with 50-nm average particle diameter was readied as nanometer-size Si particles. Polyamide-imide resin produced by SIGMA-ALDRICH JAPAN Limited Liability Company was readied. Copper phthalocyanine produced by SIGMA-ALDRICH JAPAN Limited Liability Company was readied.

first embodiment

[0094]50-part-by-mass nanometer-size Si particles, 10-part-by-mass polyamide-imide resin, and 10-part-by-mass copper phthalocyanine were weighed out. The nanometer-size Si particles, polyamide-imide resin, and copper phthalocyanine were added to 30-part-by-mass N-methyl-2-pyrrolidone (or NMP produced by SIGMA-ALDRICH JAPAN Limited Liability Company). The resulting mixture was put in an agate mortar, and was then kneaded. The resultant kneaded substance was dried at 100° C. for 1 hour, thereby removing the NMP from the kneaded substance.

[0095]The kneaded substance from which the NMP had been excluded was heated at 800° C. for 1 hour under an argon atmosphere, thereby obtaining an Si—Cu-carbon composite according to First Embodiment. When the Si—Cu-carbon composite according to First Embodiment was taken as 100% by mass, a content rate of the nanometer-size Si particles was about 60% by mass. The content rate of the nanometer-size Si particles was computed by actually measuring the va...

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Abstract

Providing a negative-electrode active material for nonaqueous-electrolyte secondary battery, the negative-electrode active material enabling an output characteristic to upgrade, a production process for the same, a negative electrode for nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery.The negative-electrode active material includes an Si-metal-carbon composite composed of: a metal / carbon composite matrix including at least one metal selected from the group consisting of Cu, Fe, Ni, Ti, Nb, Zn, In and Sn, at least one member selected from the group consisting of N, O, P and S, and amorphous carbon; and nanometer-size Si particles dispersed in the metal / carbon composite matrix.

Description

TECHNICAL FIELD[0001]The present invention relates to a negative-electrode active material for nonaqueous-electrolyte secondary battery, a production process for the same, a negative electrode for nonaqueous-electrolyte secondary battery, and a nonaqueous-electrolyte secondary battery.BACKGROUND ART[0002]Nonaqueous-electrolyte secondary batteries, such as lithium-ion secondary batteries, lithium secondary batteries and sodium-ion secondary batteries, are secondary batteries having high energy densities and enabling high powers to output. For example, lithium-ion secondary batteries have been used mainly as a power source for portable electronic devices. In addition, lithium-ion secondary batteries are expected to serve as a power source for electric automobiles having been anticipated to prevail from now on. A lithium-ion secondary battery has a battery construction in which the positive electrode and negative electrode are made of an active material being able to sorb (or occlude) ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/60H01M4/38
CPCH01M4/364H01M4/386H01M10/0525H01M4/604H01M4/60H01M4/587H01M4/38H01B1/04H01B1/22Y02E60/10
Inventor SUGIYAMA, YUSUKENIIMI, TOMOHIRONAKANISHI, MASATAKASONE, HIROTAKAKAWASUMI, KAZUHITOMURASE, MASAKAZU
Owner TOYOTA IND CORP